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Solubility of dialkylalkyl phosphonates in supercritical carbon dioxide: Experimental and modeling approach

Pitchaiah, K C and Rao, Brahmmananda C V S and Sivaraman, N and Joseph, M and Madras, Giridhar and Brondz, Ilia (2017) Solubility of dialkylalkyl phosphonates in supercritical carbon dioxide: Experimental and modeling approach. In: FLUID PHASE EQUILIBRIA, 435 . pp. 88-97.

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Official URL: http://dx.doi.org/10.1016/j.fluid.2016.12.011

Abstract

Diallcylalkyl phosphonates have found renewed interest in the selective extraction of actinides from different matrices. In this context, two dialkylalkyl phosphonates, dibutylbutyl phosphonate (DBBP) and diamylamyl phosphonate (DAAP) were synthesised and their solubilities in supercritical carbon dioxide (SCCO2) medium were determined in the pressure range of 10-25 MPa at 313-333 K. Solubility studies were carried out to examine their utility as ligands during supercritical fluid extraction of actinides. Solubilities of dialkylalkyl phosphonates ranged from 0.06 to 0.12 mole fraction. Experimental solubilities were correlated using Mendez-Santiago, Chrastil, solution theory with Wilson activity coefficient model and association model based on van Laar activity coefficient model. Comparison among these models revealed that the association model with van Laar activity coefficient model provides better solubility predictions. SCCO2 containing DAAP was employed for the (i) selective extraction of uranium in the presence of simulated fission products and (ii) extraction of uranyl nitrate from acidic medium. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 15 Mar 2017 04:24
Last Modified: 15 Mar 2017 04:24
URI: http://eprints.iisc.ac.in/id/eprint/56377

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